Fracturing and cavern integrated completion method for coal-bed gas reservoir

Abstract

The invention relates to a fracturing and cavern integrated completion method for a coal-bed gas reservoir. The method comprises the following steps: firstly, forming a crack connected with a shaft in a coal bed through hydraulic fracturing equipment, and then, performing cavern completion operation by utilizing fluid supercharging equipment, a supercharging pipeline, fluid depressurization equipment and a depressurization pipeline to form a wide-range permeability growth zone, therefore increasing the production rate of coal-bed gas. According to the fracturing and cavern integrated completion method for the coal-bed gas reservoir, provided by the invention, by comprehensively utilizing the advantages of hydraulic fracturing and cavern completion, the design problem of a fracturing and cavern construction is solved; the fracturing and cavern integrated completion method for the coal-bed gas reservoir is especially suitable for the development of the low-permeability coal-bed gas reservoir; the production rate of the coal-bed gas is greatly increased; the high-efficient mining of the coal-bed gas of the low-permeability reservoir is realized.

Description

technical field [0001] The invention relates to an efficient well completion method for coalbed methane development, in particular to an integrated well completion method for coalbed methane reservoir fracturing and cavern completion combined with hydraulic fracturing and cavern well completion. Background technique [0002] The advancement of coalbed methane development technology will promote the efficient utilization of coalbed methane, and the low permeability of coalbeds requires transformation of coalbeds in order to realize efficient exploitation of coalbed methane. Coal bed methane cave completion is an important technical means for coal seam reconstruction, and it is also a unique way of well completion and production stimulation in the development of coal bed methane. CBM cave completion not only increases the borehole diameter and seepage area, but more importantly, improves the seepage conditions of the coal seams around the cave, thereby increasing the productio...

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Problems solved by technology

[0004] However, my country's coalbed methane reservoirs have the characteristics of high strength, low permeability and low pressure, so that after copying foreign cave completion technology, the production stimulation effect is not ideal

The United States, Australia and other countries with relatively mature CBM development technology have successfully applied cave completion technology on site, but they have not clearly recognized the mechanism of cave completion to transform coal seams

Due to the unclear understanding of the mechanism of cave completion to transform coal seams, this technology has not been successfully applied in my country, and the cave completion technology has not been improved accordingly. The existing cave completion technology cannot cause strong stress fluctuations inside the coal seam , so the purpose of reforming the coal seam has not been achieved

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